By IEEE Lasers & Electro-Optics Society
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Extra info for 1995 IEEE Conference on Lasers and Electro-Optics
36 Copyright © 2000 IEEE. All rights reserved. 09-1999 These recovery voltages will be slightly lower under field conditions due to the regulation occurring when the capacitance is switched off. The system voltage regulation, or voltage change, when the capacitive load is switched, is equal to: kvar 0 Percent voltage change = -------------------------------- × 100% kVA 0 – kvar 0 (13) where kVAo = symmetrical three-phase short circuit kVA at the point of the capacitive load; and kvaro = nominal three-phase kvar determined from open circuit voltage (same as used for kVAo) and the capacitance of the load.
The IEC 60056-1987 test method outlined below can be used as an alternate demonstration of capability. 5 kV and below: A one-minute power frequency withstand test at 80% of the original rated withstand value. 5 kV, and up to 245 kV: An impulse voltage test with a peak voltage equal to 60% of the corresponding rated lighting impulse. The waveform shall be similar to that of the applicable rated TRV as used in test duty 1 of Table 1. c) For circuit breakers rated above 300 kV and up to 420 kV: An impulse voltage test with a peak voltage equal to 80% of the corresponding rated switching impulse.
J) If tests are made with lumped capacitor banks to simulate transmission lines or cables, the test circuit may be modified to limit current surges on closing to those obtained when closing into the surge impedance of a line or cable. k) For circuit breakers equipped with shunting resistors, the thermal capability of the resistors must be considered in determining the time interval between tests. 1 Method of demonstration by measurement of overvoltages The ability of a circuit breaker design to meet its rated transient overvoltage factor shall be demonstrated by making the required series of capacitance current switching tests on an essentially lossless circuit (no resistance intentionally added).